Begging the Question

Description

The truth of A is assumed within the original premise about A. Hence A is not
really proven by the argument.

This may occur through a simple statement or via a more complex set of
statements that go around in a circle and eventually 'prove' the original
statement to be true.

Another variant is: If A is not wrong, then it is right.

Example

God exists because the Bible says so. The Bible was written
by God.

I am not a liar.

This restaurant serves the best food in the town, because it
has the best chef. It has attracted the best chef because it has the best
reputation. It has the best reputation because the chef cooks the best food.

You are not bad, therefore you must be good.

Discussion

Begging the Question does not really answer it outside of its own
assumptions. This happens when people accidentally or deliberately start from an
unproven position and try to use this to prove the position. Like a house built
on sand, the argument does not stand up to a light push.